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基于硝酸介质中,亚硝酸盐氧化亚铁氰化钾的化学反应,研究了测定痕量NO_2N的新方法。ε=6.9×10~5,测定范围0～20μg/25ml。本法用于测定污水中的痕量NO-_2N,变动系数为1.86～2.63%。
Based on the chemical reaction of nitrite and potassium ferrocyanide in nitric acid medium, a new method for the determination of NO 2 N was developed. ε = 6.9 × 10 ~ 5, the measurement range 0 ~ 20μg / 25ml. This method is used to determine the trace amount of NO-2N in wastewater, with a coefficient of variation of 1.86 ~ 2.63%.